I'm not fond of nipple or genital piercings.
It wouldn't play a role in my deciding to date a woman or not, but to me it seems like ruining a nice piece of art.
If she offered to take them out on her own, I'd accept the offer, but I'd never ask.
I don't mind eyebrow / lip / nose / ear piercings. I just don't like them on nipples or labia.